//
// System.Web.Configuration.ProvidersHelper
//
// Authors:
//	Chris Toshok (toshok@ximian.com)
//
// (C) 2005 Novell, Inc (http://www.novell.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


using System;
using System.Collections;
using System.Configuration;
using System.Configuration.Provider;
using System.Data.Common;
using System.Data.SqlClient;
using System.IO;
using System.Reflection;
using System.Web;
using System.Web.Compilation;
using System.Collections.Specialized;

namespace System.Web.Configuration {

	public static class ProvidersHelper
	{
		public static ProviderBase InstantiateProvider (ProviderSettings providerSettings, Type providerType)
		{
			Type settingsType = HttpApplication.LoadType (providerSettings.Type);
			if (settingsType == null)
				throw new ConfigurationErrorsException (String.Format ("Could not find type: {0}",
										       providerSettings.Type));
			if (!providerType.IsAssignableFrom (settingsType))
				throw new ConfigurationErrorsException (String.Format ("Provider '{0}' must subclass from '{1}'",
										       providerSettings.Name, providerType));

			ProviderBase provider = Activator.CreateInstance (settingsType) as ProviderBase;

			NameValueCollection col = new NameValueCollection (providerSettings.Parameters);
			provider.Initialize (providerSettings.Name, col);

			return provider;
		}

		public static void InstantiateProviders (ProviderSettingsCollection configProviders, ProviderCollection providers, Type providerType)
		{
			if (!typeof (ProviderBase).IsAssignableFrom (providerType))
				throw new ConfigurationErrorsException (String.Format ("type '{0}' must subclass from ProviderBase", providerType));

			foreach (ProviderSettings settings in configProviders)
				providers.Add (InstantiateProvider (settings, providerType));
		}

		internal static DbProviderFactory GetDbProviderFactory (string providerName)
		{
			DbProviderFactory f = null;

			if (providerName != null && providerName != "") {
				try {
					f = DbProviderFactories.GetFactory(providerName);
				}
				catch (Exception e) { Console.WriteLine (e); /* nada */ }
				if (f != null)
					return f;
			}

			return SqlClientFactory.Instance;
		}
	}

}


